Update gcloud versions (#340)

Update latest gcloud versions

Author: google-github-actions-bot

data/versions.json

@@ -484,5 +484,6 @@
   "527.0.0",
   "528.0.0",
   "529.0.0",
-  "530.0.0"
+  "530.0.0",
+  "531.0.0"
 ]